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(13/3)*x^2+(5/2)*x^2-(12*x^2)-((1/3)*x^2) = 0
(13/3)*x^2+(5/2)*x^2-12*x^2+(-1/3)*x^2 = 0
-11/2*x^2 = 0 // : -11/2
x^2 = 0
x = 0
x = 0
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